A single layer flex PCB is a type of circuit board that is flexible and has conductive traces on only one side. It designed to provide electronic connections in applications. where flexibility required, such as in compact and space-constrained devices. In a single layer flex PCB, the conductive traces, also known as tracks. Typically patterned on one side of the flexible substrate using a conductive material like copper. 


  • More than 10 years of flexible PCB manufacturing experience;
  • Provide with 1-10 layer flexible circuit board fabrication service;
  • Comply with ISO9001 & IPC level 2 or 3 standards
  • Provide fast turn multilayer flexible PCB prototype services;
  • The thickness of the multilayer FPC is 0.05-2.5mm, and the copper thickness is 1/3oz-2oz;
  • Supply 7*24 hours of sales, technical, and after-sales service support.

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Flexibility & Bendability

flexibility pcb fpc Gesflex circuit

The primary advantage of using flex PCBs is their flexibility. Single-sided flex PCBs could bent, folded. or twisted to fit into tight spaces or conform to the shape of the device or product integrated into. This flexibility allows for more compact and innovative designs. particularly in applications where space limited.

Lightweight & Compact Design

4 LAYER FLEX PCB- EMI Shielding and Signal Isolation

Single-sided flex PCBs are lightweight and thin. making them ideal for applications where weight and size reduction are crucial. They help to minimize the overall dimensions and weight of electronic devices. making them more portable and easier to handle.

Reliable and Durable

4 LAYER FLEX Enhanced Power Distribution

Flex PCBs designed to withstand repeated flexing and bending without compromising their functionality. They are often more resistant to vibration, shock. and mechanical stress compared to rigid PCBs. This durability makes them suitable for applications in harsh environments. or where the device is subject to movement or bending.

Simplified Assembly

4 LAYER FLEX PCB-Improved Signal Integrity

Single-sided flex PCBs have a simpler construction compared to multi-layer flex PCBs . They require fewer components and interconnects. reducing assembly time and potential points of failure. This simplicity can also contribute to cost savings in manufacturing.


4 LAYER FLEX PCB Better Thermal Management

Single-sided flex PCBs are generally more cost-effective compared to multi-layer flex PCBs or rigid PCBs. Their simpler construction and reduced material requirements help to lower production costs. making them a cost-effective choice for many applications.

Improved Signal Integrity

flexible pcb Space Efficiency

Single-sided flex PCBs can offer better signal integrity compared to traditional wire harnesses. The use of a single conductive layer reduces signal interference, crosstalk. and impedance mismatch issues, leading to improved electrical performance.

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The stackup of single layer flex PCB refers to the arrangement of layers and materials used in its construction. Since single layer flex PCBs have conductive traces on only one side. the stackup is relatively simple compared to multi-layer flex PCBs or rigid PCBs. Here is a typical stackup for a single layer flex PCB:

Substrate/Base Material:

The base material of asingle layer flex PCB is usually a flexible substrate. made of materials like polyimide (PI) or polyester (PET). These materials provide the required flexibility and durability for the PCB. The substrate thickness can vary depending on the specific application and design requirements.

Conductive Layer:

On the top side of the flexible substrate, a conductive layer is present, usually made of copper. The copper layer forms the conductive traces, also known as tracks. which carry electrical signals or power throughout the PCB. The thickness of the copper layer specified based on the current carrying capacity and design considerations.

Protective Layer:

To protect the conductive layer and prevent it from oxidizing or damaged. a protective layer applied on top of the copper traces. This layer typically made of a protective material like solder mask or a conformal coating. It provides insulation and protects the traces. from external factors such as moisture, dust, and mechanical stress.

Adhesive Layer (Optional):

In some cases, an adhesive layer added to bond the conductive layer with the substrate more . This adhesive layer is typically a heat-activated or pressure-sensitive adhesive. that helps to ensure the stability and integrity of the PCB during flexing or bending.

It’s important to note that the stackup of asingle layer flex PCB can vary depending on specific design requirements. such as the need for additional layers, shielding, or special materials. However, the basic stackup described above represents a common configuration forsingle layer flex PCBs.

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2Layer Flex PCB


This is the simplest flexible PCB. It consists of a single conductive layer on a flexible substrate. Components placed on one side of the substrate. and the other side used for protective covering 

4 Layer Flex PCB


Due to our extensive technical knowledge and well-equipped facilities, we can guarantee the quickest turnaround times on all sorts of printed circuit boards, including 6 layer flexible PCB.

Rigid-flex PCB


GESFLEX manufactures high-performance flex PCBs. These circuit boards assist us in meeting the most difficult design. Particular high performance 8 layer flex PCB.

Multilayer Flex PCB


Rigid-flex PCBs combine both rigid and flexible PCBs. They consist of rigid sections and flexible sections. allowing for both mechanical support  within a single board. 

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Flexible Circuit , Rigid-flex PCB, FPC Flexible PCB Assembly For One-Stop Request a Quote for Flexible PCB Fabrication


The choice of material forsingle layer flex PCBs is crucial. As it determines the flexibility, durability. electrical performance, and other characteristics of the PCB. The most commonly used materials forsingle layer flex PCBs include:

Polyimide (PI):

Polyimide is a popular material forsingle layer flex PCBs. due to its excellent flexibility, high-temperature resistance, and good electrical insulation properties. It can withstand repeated bending and flexing. without losing its mechanical or electrical properties. Polyimide-basedsingle layer flex PCBs are commonly used in applications that require flexibility. such as consumer electronics and aerospace industries.

Polyester (PET):

Polyester is another commonly used material forsingle layer flex PCBs. It offers good flexibility, thermal stability, and chemical resistance. PET-basedsingle layer flex PCBs are often chosen for applications. where cost-effectiveness and moderate flexibility are important factors.

Flexible Adhesive:

In some cases, a flexible adhesive layer used insingle layer flex PCBs. to bond the conductive layer with the substrate securely. The adhesive layer provides additional mechanical strength. and stability to the PCB during flexing or bending. The type of adhesive used depends on the specific requirements of the application.

It’s important to note that other materials or material combinations. used for specific applications or to achieve desired properties. For example, hybrid constructions that combine different materials like polyimide. and epoxy used to achieve a balance between flexibility and rigidity in certain scenarios.

The choice of material depends on the specific requirements of the application. including factors like desired flexibility, temperature range, chemical resistance, electrical performance. and cost considerations. Designers and engineers carefully evaluate these factors to select the most suitable material. forsingle layer flex PCBs in their specific applications.

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flexible pcb board manufacturing process-design

Step1: Design and Material Selection:

The first step is to design the PCB layout using computer-aided design (CAD) software. The design includes the placement of components, routing of traces. and any necessary cutouts or openings for flexing. The layout optimized to ensure proper functionality and manufacturability.

Step2: Substrate Preparation:

The flexible substrate material, such as polyimide (PI) or polyester (PET). is prepared for the PCB. The substrate is typically supplied in roll form. It cleaned, inspected, and may undergo surface treatment. to improve adhesion and remove any contaminants.

flexible pcb board manufacturing process-material prepartion
flexible pcb board manufacturing process-copper cladding

Step3: Adhesive Application (Optional)

If an adhesive layer required, it applied to one side of the flexible substrate. The adhesive layer provides bonding between the substrate and the conductive layer. enhancing the overall stability of the PCB during flexing.

Step4: Conductive Layer Deposition

A layer of conductive material, usually copper, deposited onto the prepared substrate. This done using various techniques such as lamination, electroplating. or adhesiveless copper clad laminate (CCL) bonding. The copper layer forms the conductive traces. and any required pads or features on the single-layer flex PCB.

flexible pcb board manufacturing process-etching
flexible pcb board manufacturing process-drilling

Step5: Imaging and Etching

A photosensitive resist layer, known as the solder mask or photoresist. is applied over the conductive layer. The resist exposed to ultraviolet light through a photomask. which defines the desired trace pattern. After exposure, the resist developed, leaving behind the protective coating only on the desired traces. The exposed copper areas are then etched away, leaving the conductive traces intact.

Step6 :Solder Mask Application

A solder mask applied to protect the conductive traces and facilitate soldering during assembly. The solder mask is typically applied using a screen printing process. leaving openings for component pads and vias.

flexible pcb board manufacturing process- lamination
flexible pcb board manufacturing process-Coverlay

Step7 : Surface Finishing (Optional)

Depending on the specific requirements, the PCB may undergo surface finishing processes. Common surface finishes include HASL (Hot Air Solder Leveling). ENIG (Electroless Nickel Immersion Gold), or immersion tin. These finishes improve the solderability of the PCB and provide protection against oxidation.

Step 8 : Routing and Profiling

The PCB routed to remove any excess material and shape it to the desired dimensions. This step involves cutting the PCB along its outer edges. and any internal cutouts or openings for flexing .

flexible pcb board manufacturing process-surface finishing
flexible pcb board manufacturing process-testing

Step 9 : Inspection and Testing

The completed single-layer flex PCB undergoes thorough inspection. and testing to ensure its quality and functionality. Various tests, including electrical continuity, impedance measurement, and visual inspection. performed to verify that the PCB meets the required specifications.

Step 10 : Assembly and Integration

Once the single-layer flex PCB passes inspection. it assembled with components using standard surface mount. or through-hole assembly processes, depending on the specific design and requirements.

flexible pcb board manufacturing process-assembly

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consumer electronics for flexible pcb

Consumer Electronics

Single layer flex PCBs are widely used in consumer electronic devices. such as smartphones, tablets, wearable devices, and portable gaming consoles. They enable compact and flexible designs, allowing for space-saving and lightweight products.



In the automotive industry,single layer flex PCBs used in applications. such as dashboard displays, infotainment systems, control modules, and sensor systems. The flexibility of the PCBs allows them to conform to the shape of the vehicle’s interior components.

medical devices for flexible pcb

Medical Devices

single layer flex PCBs utilized in medical devices . such as pacemakers, hearing aids, medical imaging equipment, and diagnostic devices. The flexibility of the PCBs allows for integration into small. and contoured medical devices while ensuring reliable performance.

Industrial Electrical Equipment

Industrial Equipment

Single layer flex PCBs utilized in industrial equipment. such as sensors, control systems, robotics, and automation devices. Their flexibility allows them to integrated into complex machinery. and withstand harsh operating conditions.

flexible circuits for IOT

Communication Devices:

Single layer flex PCBs used in communication devices. such as antennas, routers, modems, and wireless devices. Their flexible nature enables efficient placement of components and antennas, optimizing signal performance.

Professional One-stop Flexible PCB & FPC Services RELIABLE FLEX PCB BOARD MANUFACTURER

IF you are looking for high quality flexible pcb board. and flexible pcb board for your projects. GESFLEX CIRCUITS is a good choice as a competitive China flexible pcb board. We have been making flex PCBs for large volume production as well as prototypes since the 2014. We use unique, custom-built tools that give us the edge over our competitors. Beacuse rich experience, advanced equipment, stable PCB fabricaition. strict quality control all represent our strength . you can upload your Gerber files to our cloud, for an instant quote.

flex pcb fabrication